Contacting a biological father

I need some help, I'm unsure what to do here, my daughter is almost 13, her biological father walked out on her when she was 2 because he was too busy with university to be a dad, my daughter was bought up by my husband since she was 13 months old, anyway, we are having ALOT of trouble with her at the moment, she reckons the grass will be greener elsewhere, now I'm not giving up on her, but i always said if she ever asked to meet him I wouldn't deny it and would do what I can to make it happen, so my question is, where do I start? How should I go about this? I know where he works etc he often pops up in my Facebook "people you may know" should I email him, call his work, Facebook, any other suggestions, I'm worried he won't be interested. Which is not fair to her but what do I do!

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ETA: So if he is like most typical males, it will probably be on basic filtering anyway- and because FB has suggested you may know each other (oh, if only you knew, FB!) it would most likely just go straight to his inbox.
If he is a bit more of the tech-savvy kind, then yes- there is a very high probability that it will be filtered into other. Of course, I'm just generalising- you know him best. Go with your gut.
If you can find his phone number a message might be your best back up plan. Even just a "Hey, sorry to contact you on your private phone. I sent you a message on FB regarding DD and I think it may have gone to your other folder. She would really like to meet you. If you could please take some time to think about all of this and then respond when you are ready it would mean a lot to her" etc.

ETA: So if he is like most typical males, it will probably be on basic filtering anyway- and because FB has suggested you may know each other (oh, if only you knew, FB!) it would most likely just go straight to his inbox.
If he is a bit more of the tech-savvy kind, then yes- there is a very high probability that it will be filtered into other. Of course, I'm just generalising- you know him best. Go with your gut.
If you can find his phone number a message might be your best back up plan. Even just a "Hey, sorry to contact you on your private phone. I sent you a message on FB regarding DD and I think it may have gone to your other folder. She would really like to meet you. If you could please take some time to think about all of this and then respond when you are ready it would mean a lot to her" etc.

He's a architectural engineer, he's very tech savvy!
But great idea, if I can track his number down!

I just wanted to update those who replied, contact was made and it went amazingly, everyone has grown up now and there's been no more fighting, he's looking forward to making contact with her and seeing her and vice versa

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